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The MAC 129 is my favorite blush brush. It takes absolutely no effort, it`s pretty big so you only have to sweep in one direction and it`s tapered so it blends everything out so easily!
The MAC 150 on the other hand is a brush that I really HATE. It`s scratchy and hard it doesn`t do a very good job at anything, it leaves me looking powdery and ugh I just overall I hate it! You`re better off getting the $3 ELF brush as this one is very expensive it`s not worth the money.
But I do recommend the 129 if you are looking to spend a little bit more money on a blush brush and are looking to try mac brushes :)
*THIS PICTURE IS MINE!